<template>
	<view class="base-table" :style="[getTableStyle]" :class="{ 'is-border': border, 'no-data': data.length === 0 }">
		<view class="base-table-inner">
			<view class="base-table-header" v-if="showHeader">
				<view class="b-table" :style="[tableBodyStyle]">
					<view class="b-thead">
						<view class="b-tr" :class="getHeaderClass" :style="getHeaderStyle" @click="handleHeaderClick">
							<view class="b-th" v-if="indexShow" :style="[getIndexColStyle]"><view class="b-cell">序号</view></view>
							<view class="b-th" v-for="item in columns" :key="item.fieldName" :class="[getCellProps(item).class]" :style="[getCellProps(item).style]">
								<view class="b-cell">{{ item.fieldDesc }}</view>
							</view>
						</view>
					</view>
				</view>
			</view>
			<view class="base-table-body">
				<view class="b-table" :style="[tableBodyStyle]">
					<view class="b-tbody" v-if="data.length > 0">
						<view
							class="b-tr"
							v-for="(scope, index) in data"
							:key="index"
							:class="[getBodyClass(scope, index)]"
							:style="[...getBodyStyle(scope, index)]"
							@click="handleRowClick(scope, index)"
						>
							<view class="b-td" v-if="indexShow" :style="[getIndexColStyle]">
								<view class="b-cell">{{ getIndexMethod(index) }}</view>
							</view>
							<view class="b-td" v-for="column in columns" :key="column.fieldName" :class="[getCellProps(column).class]" :style="[getCellProps(column).style]">
								<view class="b-cell" @click.stop="handleCellClick(scope, column, index)">
									<slot name="item" :scope="scope" :column="column" v-if="column.fieldType === 'slot'"></slot>
									<view v-else>{{ scope[column.fieldName] }}</view>
								</view>
							</view>
						</view>
					</view>
					<view class="base-table-empty" v-else>
						<view class="mt20" v-if="!$slots.empty">{{ emptyText }}</view>
						<slot name="empty"></slot>
					</view>
				</view>
			</view>
			<view class="base-table-footer" v-if="showFooter">
				<view class="b-table" :style="[tableBodyStyle]">
					<view class="b-tbody">
						<view class="b-tr">
							<view class="b-td" v-if="indexShow" :style="[getIndexColStyle]">
								<view class="b-cell">{{ footerText }}</view>
							</view>
							<view
								class="b-td"
								v-for="(item, index) in sumList"
								:key="index"
								:class="[getCellProps(columns[index]).class]"
								:style="[getCellProps(columns[index]).style]"
							>
								<view class="b-cell">{{ item }}</view>
							</view>
						</view>
					</view>
				</view>
			</view>
		</view>
	</view>
</template>

<script>
export default {
	props: {
		columns: {
			type: Array,
			default: () => []
		},
		data: {
			type: Array,
			default: () => []
		},
		align: {
			type: String,
			default: 'left'
		},
		height: {
			type: String
		},
		maxHeight: {
			type: String
		},
		width: {
			type: String,
			default: '100%'
		},
		emptyText: {
			type: String,
			default: '暂无数据'
		},
		border: {
			type: Boolean,
			default: false
		},
		stripe: {
			type: Boolean,
			default: false
		},
		showHeader: {
			type: Boolean,
			default: true
		},
		showFooter: {
			type: Boolean,
			default: false
		},
		footerMethod: {
			type: Function
		},
		footerText: {
			type: String,
			default: '合计'
		},
		indexShow: {
			type: Boolean,
			default: false
		},
		minItemWidth: {
			type: Number,
			default: 80
		},
		rowClassName: {
			type: [Function, String]
		},
		rowStyle: {
			type: [Function, Object]
		},
		indexMethod: {
			type: Function
		},
		headerRowClassName: {
			type: String
		},
		headerRowStyle: {
			type: Object
		},
		indexWidth: {
			type: String,
			default: '60px'
		}
	},
	data() {
		return {
			sumList: [],
			tableWidth: 0
		};
	},
	mounted() {
		const query = uni.createSelectorQuery().in(this).select('.base-table');
		query.boundingClientRect(data => {
				this.tableWidth = data.width;
		}).exec();
	},
	computed: {
		getTableStyle() {
			const { width, height, maxHeight } = this;
			const styleObj = {};
			if (width) {
				styleObj.width = width;
			}
			if (height) {
				styleObj.height = height;
			}
			if (maxHeight) {
				styleObj.maxHeight = maxHeight;
			}
			return styleObj;
		},
		tableBodyStyle() {
			if (!this.tableWidth) return {};
			const clienWidth = this.tableWidth;
			const flexColumn = this.columns.filter(item => !item.width);
			//set min width
			const minWidth = this.minItemWidth;

			let bodyMinWidth = this.columns.reduce((t, c) => {
				c.width = c.width || minWidth;
				return t + parseFloat(c.width);
			}, 0);
			if(this.indexShow){
				bodyMinWidth+=parseFloat(this.indexWidth)
			}
			if (flexColumn.length > 0 && bodyMinWidth < clienWidth) {
				const flexWidth = clienWidth - bodyMinWidth;
				if (flexColumn.length === 1) {
					flexColumn[0].width = minWidth + flexWidth;
				} else {
					const scaleWidth = flexWidth / flexColumn.length;
					flexColumn.forEach(item => {
						item.width = minWidth + Math.floor(scaleWidth);
					});
				}
			}
			bodyMinWidth = Math.max(bodyMinWidth, clienWidth);
			return {
				width: `${bodyMinWidth}px`
			};
		},
		showXScroll() {
			const clienWidth = this.tableWidth;
			return clienWidth < parseFloat(this.tableBodyStyle?.width || 0);
		},
		isEmpty() {
			return this.data.length === 0;
		},
		getHeaderClass() {
			const headerClass = [];
			if (this.headerRowClassName) {
				headerClass.push(this.headerRowClassName);
			}
			return headerClass;
		},
		getHeaderStyle() {
			const headerStyle = [];
			if (typeof this.headerRowStyle === 'object') {
				if (this.headerRowStyle) {
					headerStyle.push(this.headerRowStyle);
				}
			}
			return headerStyle;
		},
		getIndexColStyle() {
			return {
				textAlign: this.align,
				width: this.indexWidth
			};
		}
	},
	methods: {
		init() {
			this.sumList = [];
			if (this.showFooter && this.data.length > 0) {
				const { columns, data, footerText } = this;
				if (typeof this.footerMethod === 'function') {
					this.sumList = this.footerMethod({ columns, data });
				} else {
					columns.forEach((column, index) => {
						if (!this.indexShow && index === 0) {
							this.sumList[index] = footerText;
							return;
						}
						const values = data.map(item => Number(item[column.fieldName]));
						const precisions = [];
						let notNumber = true;
						values.forEach(value => {
							if (!Number.isNaN(+value)) {
								notNumber = false;
								const decimal = `${value}`.split('.')[1];
								precisions.push(decimal ? decimal.length : 0);
							}
						});
						const precision = Math.max.apply(null, precisions);
						if (!notNumber) {
							this.sumList[index] = values.reduce((prev, curr) => {
								const value = Number(curr);
								if (!Number.isNaN(+value)) {
									return Number.parseFloat((prev + curr).toFixed(Math.min(precision, 20)));
								} else {
									return prev;
								}
							}, 0);
						} else {
							this.sumList[index] = '';
						}
					});
				}
			}
		},

		getBodyClass(scope, index) {
			const bodyClass = [];
			if (this.stripe) {
				bodyClass.push({ 'is-stripe': index % 2 === 1 });
			}
			if (typeof this.rowClassName === 'function') {
				const rowClass = this.rowClassName?.(scope, index);
				if (rowClass) {
					bodyClass.push(rowClass);
				}
			} else if (typeof this.rowClassName === 'string') {
				if (this.rowClassName) {
					bodyClass.push(this.rowClassName);
				}
			}
			return bodyClass;
		},

		getBodyStyle(scope, index) {
			const bodyStyle = [];
			if (typeof this.rowStyle === 'function') {
				const rowStyle = this.rowStyle?.(scope, index);
				if (rowStyle) {
					bodyStyle.push(rowStyle);
				}
			} else if (typeof this.rowStyle === 'object') {
				if (this.rowStyle) {
					bodyStyle.push(this.rowStyle);
				}
			}
			return bodyStyle;
		},

		getIndexMethod(index) {
			let curIndex = index + 1;
			if (typeof this.indexMethod === 'function') {
				curIndex = this.indexMethod?.(index);
			}
			return curIndex;
		},

		getCellProps(row) {
			const classList = [];
			if (this.showXScroll && row.fixed) {
				classList.push('fixed');
				if (row.fixed === 'left') {
					classList.push('fixed-left');
				} else {
					classList.push('fixed-right');
				}
			}
			return {
				class: classList,
				style: {
					width: `${row.width}px`,
					textAlign: this.align,
					minWidth: `${this.minItemWidth}px`
				}
			};
		},

		handleHeaderClick() {
			this.$emit('header-click');
		},

		handleRowClick(scope, index) {
			this.$emit('row-click', scope, index);
		},

		handleCellClick(scope, column, index) {
			this.$emit('cell-click', { scope, column, index });
		},
	},
	watch: {
		data: {
			handler() {
				this.init();
			},
			immediate: true,
			deep: true
		}
	}
};
</script>

<style lang="scss" scoped>
@import './basic-table.scss';
</style>
